Fetch Art (VersionTracker info) is working again with iTunes 4.7.1 (with OSX 10.3.7). I used to use it a lot to update my album artwork, but it stopped working when iTunes 4.5 came out -- it started scanning the entire current playlist instead of just the selected tracks.

I tried it by chance today and it works again! Fetch Art, together with Douglas Adams' Find Songs Without Artwork script, takes all the pain out of updating the artwork of your iTunes library. For Fetch Art to work well, the tags for all the songs should be correct ... and that's where ieatbrainz comes in really handy (much better than a plain CDDB lookup).